京杭运河杭州段水质模型研究

Research on water quality model for Hangzhou reach of Beijing-Hangzhou Canal

以京杭运河杭州段为对象,研究主要水污染超标因子氨氮的浓度预测方法。选取2007年6月2～10日运河实测水质变化过程,根据干流各节点的初始浓度和各支流的浓度,结合水位流量自动监测数据,分别用简化水库模型和有限差分法预测运河干流各节点的氨氮浓度,并与实测值进行比较分析。简化水库模型和有限差分法应用于该次水体氨氮浓度计算中,两者的误差均在5%以内,对运河水质预测均有一定的代表性。

Taking Hangzhou reach of Beijing- Hangzhou Canal as the object, the way of forecasting density of ammonia and nitrogen factors in polluted water body is analyzed in the paper. According to the variation process of water quality measured on 2 to 10 June, 2007, and primary density of main river and the density of tributary rivers, the density of ammonia and nitrogen for the nodal points of the canal is forecasted by using simplified reservoir model anti finite - difference method. It shows that the error of the two methods is less than 5 percent, compared with measured data.